[Problem of mixed infections in viral hepatitis].

The author reviews virus associations on combination (1) of virus hepatitides A and B, (2) virus hepatitides A and "non-A, non-B", (3) virus hepatitides B and "non-A, non-B", (4) virus hepatitis B during superinfection with a delta-agent; (5) virus hepatitis B and the acquired immunodeficiency syndrome. Describes clinical observations, summarizes the clinical data. Analyzes theoretical aspects (interference, cumulative and potentiating effects) as well as the clinical objectives including the problems of the diagnosis and prophylaxis of cross virus infections.